The best open source alternative to Quicken is GnuCash. If that doesn't suit you, our users have ranked more than 100 alternatives to Quicken and loads of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Quicken are HomeBank, MoneyManager Ex, Firefly III and KMyMoney.
Ledger is a powerful, double-entry accounting system that is accessed from the UNIX command-line. This may put off some users, since there is no flashy UI, but for those who want unparalleled reporting access to their data there are few alternatives.
Budget5S aims to offer a free alternative to budget managers. This is an alpha version, with new features to come, changes to be made, and, ESPECIALLY, bugs to be fixed, so it's for informed users. You've been warned!
MyMoney.Net is an Open Source rich client .NET 4.0 ClickOnce application for managing your personal finances. It supports OFX online banking and stores all your data in sqllite.
Reckoner is an encrypted local first personal finance tracker. Your data is on your device only.
jGnash is a free (no strings attached!) personal finance manager with many of the same features as commercially-available software. It was created in order to make tracking your personal finances easy, but also provides the functionality required by advanced users.
FrontAccounting is a simple, but powerful, system for the entire ERP chain and covers:
Eqonomize! is a cross-platform personal accounting software, with focus on efficiency and ease of use for the small household economy. Eqonomize! provides a complete solution, with bookkeeping by double entry and support for scheduled recurring transactions, security...
Yapbam is a personal bank account manager.
Yapbam is free, open-source (GPL v3), cross-platform (it runs under Windows, MacOs, Linux, etc), portable (you can put it on an USB key) and easy to use. Geeks will be happy to know that it is also extensible (you can add Java written p.
Grisbi is a personal accounting application running under GNU/Linux and Windows, released under the GPL licence.
Financius - Expense Manager is a simple application that helps you log and track your expenses and keep an eye on your balance.
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Quicken files import is very easy. French comptability included (personal et profesionnal approach possible). Simple but effective !